1: Simple conceptual problem to help you understand the relation between voltage, resistance and current.

2: Moderately difficult capacitance with dielectric problem. Perhaps is has a large scare factor but the actual thinking and execution aren't bad.

3: Conceptual problem with biological relevance. See? This stuff is important. Maybe someone actually had a clue when they made physics a requirement for your major!

4: Oh my God! Another integral. Simple in concept. Moderate to difficult execution for this course.

5: Conceptual exploration of power, voltage, current and resistance. Low difficulty if you understand the relation between these quantities.

7: This was an exam problem in P114 in 1999. It tests for a basic understanding of power, current and voltage (dc). This is low to low-moderate difficulty.